C5H8 are izomeri de pozitie a triplei legaturi ,izomeri de catena,si izomeri de functiune( alcadiene)
CH≡C-CH2-CH2-CH3 1 pentina
CH-C≡C-CH-CH3 2 pentina
CH≡C-CH(CH3)-CH3 3-metil-1- pentina
CH2=C=CH-CH2-CH2-CH3 1-2-pentadiena
CH2=CH-CH=CH-CH3 1-3-pentadiena
CH2=CH-CH2-CH=CH2 1-4-PENTADIENA